Camera and Tripod 3/8 to 1/4 Adapter Screw : ID 2392 : $1.50 : Adafruit Industries, Unique & fun DIY electronics and kits
Universal Tripod Mount™ Kit – Guerrilla Painter
High Quality 1/4" 3/8" Screw Mount Set Professional Tripod Thread Screw Converter Adapter for Camera Tripod Light Stand, Photography, Photography Accessories, Tripods & Monopods on Carousell
Tripod thread - The thread sizes at tripod thread - https://threadingtoolsguide.com/en//en//en//
Tripod (photography) - Wikipedia
Midwest Photo Tether Tools Rock Solid 1/4"-20 Mighty Mount Adhesive Tripod Adapter w/ Hot Shoe
What is the Standard Camera Tripod Screw Thread Size – DIY Video Studio
Tripod adapter from 3-1/2" x 8 tripod thread to 5/8" thread
1/4 To 5/8 Laser Level Tripod Thread Adapter Camera Tripod | Fruugo TR
Camera Mount Thread Sizes - Tap & Die Size + Hole Size + EVERYTHING ELSE - YouTube